Voltage and mAh questions

[Hottody]

If a 900 mAh device is advertised as a 3.7 volt device, does that mean that under load it should Vape at 3.7 volts? If it vapes at 3.5 is that acceptable?

Also, if a device is advertised as 900 mAh, what should one expect for battery performance in terms of number of vapes per charge and or Vape time?

 

[Mudflap]

That's a loaded question. Short answer:

Some devices use Pulse Width Modulation (PWM) to deliver voltage to the atty/carto. It drops the voltage from 3.7 to somewhere around 3.2 to 3.4 volts but it provides consistent voltage to the atty/carto until the battery is discharged to the point where it requires to be recharged. Other devices provide unregulated voltage from the battery to the atty/carto and a fully charged battery will start off at 4.10 to 4.20 volts and then start to sag as the battery discharges with use. Depending on the size and type of battery, most of them will drop 0.2 to 0.5 volts under load. It's acceptable in that range.

Battery performance of a 900 mAh device would depend on the resistance of the atty/carto used and how frequently it gets used. Lower resistance attys/cartos will drain the battery faster and so will chain vaping.

 

[DaveP]

What mudflap said. The general rule of thumb is that 100mah of capacity in a battery translates to an hour of vaping time. Atty resistance and vaping style vary that a bit, but higher mah ratings mean longer vaping time on a charge.

Atty resistance and voltage determine the warmth, vapor, and taste of the vape. Lower resistance gives you more wattage at the coil, which means warmer temperatures and more vapor. Raising the voltage does the same thing, so you have to balance voltage and resistance to arrive at the proper wattage for your preference. This is why many people like variable voltage batteries. You can tailor the vape to the juice you are using.

Most Li-ion batteries are 4.2v cells. Under load, an unregulated ecig battery will quickly fall to 3.7v and slowly decline until cutoff is reached. A regulated battery like the eGo, will maintain 3.4v or so throughout the charge and will reach cutoff when the battery can't maintain 3.4v anymore and drops to around 3.2v.

 

[Kent C]

If a 900 mAh device is advertised as a 3.7 volt device, does that mean that under load it should Vape at 3.7 volts? If it vapes at 3.5 is that acceptable?

Also, if a device is advertised as 900 mAh, what should one expect for battery performance in terms of number of vapes per charge and or Vape time?

Certain eGo style batteries hold at 3.7v underload - Special Edition Rivas available at Liberty Flights. Joye eGo's generally run from 3.2-3.4 volts underload, however it's reported that the newer eGo-c battery runs at 3.5V underload. As far as 'Is it acceptible?' ... it depends on what wattage is best for the flavors that you're vaping and what the ohm rating of your atty or carto.

Some flavors are enhanced by more wattage, some lighter flavors are diminshed/washed out or even burnt. I've found that the eGo batteries work well with either Low Resistance (1.5-2.0 ohms) or the Standard resistance attys (2.1-2.3ohms). Even then, some flavors may burn/wash out on the LR attys (esp. eGo-t tank systems, but oddly not with the eGo-c). For the eGo-t system, I prefer the Joye batts over the SE Rivas. Anything higher than 2.8ohm will likely not be suited for the Joye batts - weaker flavor and lower vapor, where the SE Rivas can handle up to @3.0 ohms on lighter flavors.